学习笔记 : Spring与MyBatis整合
传统DAO方式的开发整合
简介 : 采用传统DAO开发方式进行MyBatis与Spring框架的整合时,需要编写DAO接口以及接口的实现类,并且需要向DAO实现类中注入SqlSessionFactory
,然后通过SqlSessionFactory创建SqlSession. 下面通过一个使用客户id查询数据表中客户信息的案例来演示该开发方式.
customer.sql : 客户信息表
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9# 客户信息表
create table t_customer (
id INT(20) PRIMARY KEY AUTO_INCREMENT,
name VARCHAR(10) NOT NULL,
job VARCHAR(10) NOT NULL,
phone VARCHAR(12) NOT NULL
)db.properties : 数据库配置文件
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13#
#database configuration information
#
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql:xxxxxx?useSSL=false&serverTimezone=UTC&allowPublicKeyRetrieval=true
jdbc.username=xxxxxx
jdbc.password=xxxxxx
#
#DBCP configuration
#
jdbc.maxTotal=30 #最大连接数
jdbc.maxIdle=10 #最大空闲连接数
jdbc.initialSize=5 #初始化连接数applicationContext.xml : Spring核心配置文件
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<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!-- 读取db.properties -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置数据源 -->
<bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">
<!-- 数据库驱动 -->
<property name="driverClassName" value="${jdbc.driver}"/>
<!-- 连接数据库的url -->
<property name="url" value="${jdbc.url}"/>
<!-- 连接数据库的用户名 -->
<property name="username" value="${jdbc.username}"/>
<!-- 连接数据库的密码 -->
<property name="password" value="${jdbc.password}"/>
<!-- 最大连接数 -->
<property name="maxTotal" value="${jdbc.maxTotal}"/>
<!-- 最大空闲数 -->
<property name="maxIdle" value="${jdbc.maxIdle}"/>
<!-- 初始化连接数 -->
<property name="initialSize" value="${jdbc.initialSize}"/>
</bean>
<!-- 事务管理器,依赖于数据源 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 开启事务注解 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
<!-- 配置MyBatis工厂: 构建SqlSessionFactory -->
<!-- 指定数据源和配置文件: 使得Spring IOC容器在初始化id为sqlSessionFactory的Bean时解析MyBatis的配置文件,并与数据源一同保存到Spring的Bean中 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据源 -->
<property name="dataSource" ref="dataSource"/>
<!-- 指定核心配置文件位置 -->
<property name="configLocation" value="classpath:mybatis-config.xml"/>
</bean>
<!-- 实例化Dao: 为SqlSessionDaoSupport类的子类对象注入一个SqlSessionFactory -->
<bean id="customerDao" class="pers.huangyuhui.sm.dao.impl.CustomerDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>mybatis-config.xml : MyBaits核心配置文件
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<configuration>
<!-- 配置别名 -->
<typeAliases>
<!-- 通过扫描包的形式定义别名: mybatis会将所有该包中的POJO类以首字母小写的非限定类名来作为它的别名 -->
<package name="pers.huangyuhui.sm.po" />
</typeAliases>
<!-- 配置Mapper配置 -->
<mappers>
<mapper resource="pers/huangyuhui/sm/po/CustomerMapper.xml" />
</mappers>
</configuration>Customer.java : 持久层
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54package pers.huangyuhui.sm.po;
/**
* @ClassName: Customer
* @Description: 客户信息
* @author: HuangYuhui
* @date: May 24, 2019 6:38:18 PM
*
*/
public class Customer {
private Integer id;
private String name;
private String job;
private String phone;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String toString() {
return "Customer [id=" + id + ", name=" + name + ", job=" + job + ", phone=" + phone + "]";
}
}CustomerMapper.xml : 映射文件
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<mapper namespace="pers.huangyuhui.sm.po.CustomerMapper">
<!-- 根据id查询客户信息,其中`customer`为Customer类的别名 -->
<select id="findCustomerById" parameterType="Integer" resultType="customer">
select id,name,job,phone from t_customer where id = #{id}
</select>
</mapper>CustomerDao.java : DAO层
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21package pers.huangyuhui.sm.dao;
import pers.huangyuhui.sm.po.Customer;
/**
* @ClassName: CustomerDao
* @Description: TODO
* @author: HuangYuhui
* @date: May 24, 2019 6:52:30 PM
*
*/
public interface CustomerDao {
/**
* @Title: findCustomerById
* @Description: 根据id查找客户信息
* @param: id
* @return: Customer
*/
public Customer findCustomerById(Integer id);
}CustomerDaoImpl.java : CustomerDao的实现类
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28package pers.huangyuhui.sm.dao.impl;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import pers.huangyuhui.sm.dao.CustomerDao;
import pers.huangyuhui.sm.po.Customer;
/**
* @ClassName: CustomerDaoImpl
* @Description: 实现操作客户信息接口
* @author: HuangYuhui
* @date: May 24, 2019 6:54:24 PM
*/
//注意:SqlSessionDaoSupport类在使用时需要一个SqlSessionFactory或一个SqlSessionTemplate对象,所以需要通过
//Spring给SqlSessionDaoSupport类的子类对象注入一个SqlSessionFactory或SqlSessionTemplate.这样,在子类中就
//能够调用SqlSessionDaoSupport类的getSqlSession()方法来获取SqlSession对象,并使用SqlSession对象中的方法!
public class CustomerDaoImpl extends SqlSessionDaoSupport implements CustomerDao {
private String mapperNamespace = "pers.huangyuhui.sm.po.CustomerMapper.";
// 通过id查找客户信息
public Customer findCustomerById(Integer id) {
// 调用SqlSessionDaoSupport类的getSqlSession()方法来获取SqlSession对象,并使用SqlSession对象中的方法!
return this.getSqlSession().selectOne(mapperNamespace + "findCustomerById", id);
}
}
在此步骤需要在Spring配置文件applicationContext.xml中编写实例化CustomerDaoImpl的配置(已添加
),代码如下所示 :
1 | <bean id="customerDao" class="pers.huangyuhui.sm.dao.impl.CustomerDaoImpl"> |
SMTest.java : 整合测试类
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35package pers.huangyuhui.sm.test;
import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import pers.huangyuhui.sm.dao.CustomerDao;
import pers.huangyuhui.sm.po.Customer;
/**
* @ClassName: SMTest
* @Description: MyBatis+Spring整合测试
* @author: HuangYuhui
* @date: May 24, 2019 7:02:26 PM
*
*/
public class SMTest {
private static ApplicationContext applicationContext;
public static void init() {
applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");
}
public void findCustomerByIdTest() {
// CustomerDao customerDao = (CustomerDao) applicationContext.getBean("customerDao");
CustomerDao customerDao = (CustomerDao) applicationContext.getBean(CustomerDao.class);
Customer customer = customerDao.findCustomerById(1);
System.out.println(customer);
}
}log4j.properties : 日志文件
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8#Global configuration
log4j.rootLogger=DEBUG,stdout
#Log configuration
log4j.logger.pers.huangyuhui.sm.test=TRACE
#Console configuration
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.layout.ConversionPattern=%5p [%t] - %m%n程序运行结果
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10Fetching JDBC Connection from DataSource
JDBC Connection [1334618867, URL=xxxxxx, MySQL Connector/J] will not be managed by Spring
==> Preparing: select id,name,job,phone from t_customer where id = ?
==> Parameters: 1(Integer)
<== Total: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@15c25153]
Returning JDBC Connection to DataSource
Customer [id=1, name=YUbuntu0109, job=student, phone=15111111111]
Mapper接口方式的开发整合
. . .
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